btw, the second tighen to 50 ft lbs, isnt just a typo... its to make sure you check your torque wrench to make sure its set on the right spec so you dont undertighten... and also, because when you tighten other bolts it relieves pressure on the ones youve already tightened, which makes them not tightend to 50 ft lbs anymore... so once you got them all tightened, then the extra quarter turn is pretty much just to make sure its tight.....

you also have to do it in a sequence too... its not just a criss cross pattern like changing a tire, accually way too complicated to explain on here, you would have to look it up....